What a Jerk!

In my dream right before waking, I was teaching my calculus class. The board seemed much bigger than usual, and there was a student I didn't recognize. He was being a wiseass. So I spent a long time erasing the not-quite-clean board to begin class, and while doing so the unknown student asked me some question. I went over to him to talk a bit, and for some reason told him my name was Ben. I think I was planning some smartass comeback in advance. When I got back to the board it had been filled with information about video game bosses, including pictures and stats, all in colored chalk which is a bitch to erase. I started erasing again and then decided that I'd had it. I canceled the day's class right there and walked out angry. Almost all of my students were pissed off too because they had a quiz coming up and they had questions for me. One of my (very dilligent!) students in particular was running late and she would be very angry to not have class. She would probably track me down to ask questions anyway.

I realized after walking out the door why the blackboard was so big, and perhaps why there was an unknown student in the room. I had not been in our usual classroom -- I was in 315, not 215. But why was most of my class there? It can't have been the wrong room. So I figured there was some temporary room change, but I couldn't ask any of my students about this or comment on figuring the reason for the big blackboard because they were all angry at me now.